Coupling



FIG. 1 is a perspective view of the coupling.

FIG. 2 is a front view of the coupling of FIG. 1.

FIG. 3 is a back view of the coupling of FIG. 1.

FIG. 4 is a right side view of the coupling of FIG. 1.

FIG. 5 is a top view of the coupling of FIG. 1; and,

FIG. 6 is a bottom view of the coupling of FIG. 1.

The evenly dashed broken lines illustrate portions of the coupling thatform no part of the claim.

CLAIM The ornamental design for a coupling substantially, as shown anddescribed.